Thanks everyone! So helpful to hear everyone's bonding experiences and know that it is normal. It's so uncomfortable to watch that I needed some reassurance
Fingers crossed we have a positive bonding experience too.

Bonding attempt 2.
Have been really awful at this recently but have started the bonding process again tonight as I now have a week off work.

They have been in their neutral enclosure for about 20 minutes so far. Slightly less mounting than last time but there is still so much and the honking from him!
It's just so uncomfortable to watch as you have to keep an eye out to make sure he's not mounting her head still

No fighting still though. Poor Snowy. She's spent most of the time hiding in her tunnel from pesky Phillip again.

Edit: Ok it hasn't eased off at all. The only time he stops mounting is when he's tired himself out and needs a lie down!

She is running away after a while, and he does chase her to keep mounting. I keep expecting her to turn around to nip (and wouldn't blame her either!) but she doesn't!

Bonding day 3

Just a short 15 minute session today as I've got a horrible temperature and need to lie down. But I am pleased to report that there was no mounting today, partly because Phillip spent most of the time licking the kitchen cupboards

Snowy was a bit more confident today, not only venturing out of the tunnel but also eating a bit of food which she doesn't usually do when he's there.

No sooner had I reached for my cup of tea had Phillip starting honking then mounting her. She got fed up quickly today and ran. He chased and continued. She’s moulting so he ended up with a massive white beard. He continued and she kept running. Eventually she turned round and nipped. Did he get the hint?! No of course he didn’t! -_-
They continued this for another 5 minutes until he got tired:

After 5 minutes he started again so she thumped and nipped again. He still kept chasing and mounting!

There’s been no actual fighting but this is so stressful! I’ve separated them for today as I could see her getting stressed and I don’t want a stasis episode!!